Popular science monthly . nnected with the corresponding pointon the other switch. Thus when thetesting-switch is turned and its twolevers brought into contact with anypair of points, the corresponding cell isbrought into connection with the testing-lamp and the relative brilliancy of thelamp is a measure of the condition of thecell. In order to prevent short-circuitingof the cells by the use of this switch, thearms thereof are normally kept out ofcontact with the points by a spring atthe rear. By the use of a spring friction-member, shown at the bottom of theswitch, it may be set above any pa
Popular science monthly . nnected with the corresponding pointon the other switch. Thus when thetesting-switch is turned and its twolevers brought into contact with anypair of points, the corresponding cell isbrought into connection with the testing-lamp and the relative brilliancy of thelamp is a measure of the condition of thecell. In order to prevent short-circuitingof the cells by the use of this switch, thearms thereof are normally kept out ofcontact with the points by a spring atthe rear. By the use of a spring friction-member, shown at the bottom of theswitch, it may be set above any pairof points. Pressing the knob will thenmake the desired connection with thecell selected. Thebinding posts att he extreme left arefor the wires whichlead to the audioncabinet. An understanil-ing of the interiorconstruction of thecase maybe gainedby an examinationof the T, and I^ig. \iewof thecase in which thefront or switchpanel has been re-moved as well asthe top of the l*~ig. 4 the front. Fig. 7. Viewthrough the testing-switch Popular Science MontJdy 133
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
